避免jsp被瀏覽器cache

避免jsp被瀏覽器cache住而無法刷新內容，可在jsp頁面加入以下程式碼。

<%    // prevent browser cache jsp     
  response.setHeader("Pragma", "No-cache"); // HTTP 1.0
  response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
  response.setDateHeader("Expires", -1); // proxies
%>

或

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

參考：

• How to control web page caching, across all browsers?